[rrd-developers] rrd file access code

[Tobias Oetiker]

Hi Daniel,

Today Daniel.Pocock at barclayscapital.com wrote:

>
>
> Hi,
>
> I've just been reviewing the file access code and starting to implement
> a mechanism for striping multiple RRDs into one big file, to further
> reduce IO load.
>
> There are various functions in rrd_open.c (e.g. rrd_read, rrd_write)
> that can be abstracted to do what is required.
>
> However, I notice that some other files (e.g. rrd_create.c) also have
> code which accesses files directly (e.g. calling open() to create a
> file).


> Is there some ongoing work to centralise the file access code?  Would it
> be worthwhile for me to patch some of this code (e.g. rrd_create.c) to
> go through the functions in rrd_open.c, or is there some other solution
> coming?

I think create is one of the few places where there is local code,
you can try converting it, but there will be some generalisation
issues which caused the conversion not to happen the first time
around.

what you might want to keep in mind is that I intend to create a
new platform independent file format. This will also have an impact
on this ... so if you are looking closely at all this code, the
fileformat work might be integrated ...

what I have done so fahr is documented on
http://oss.oetiker.ch/rrdtool-trac/wiki/PortableRrdFormat

cheers
tobi

>
> Regards,
>
> Daniel
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900